禁止拷贝和赋值构造函数

如果想让类不能使用拷贝构造函数和赋值操作符，只要将该类的拷贝构造函数和赋值操作符函数定义为private即可，并且只是声明，不用实现.

#include <stdio.h>#include <iostream>#define RTC_DISALLOW_ASSIGN(TypeName) \  void operator=(const TypeName&) = delete#define RTC_DISALLOW_COPY_AND_ASSIGN(TypeName) \  TypeName(const TypeName&) = delete;          \  RTC_DISALLOW_ASSIGN(TypeName)#define RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \  TypeName() = delete;                               \  RTC_DISALLOW_COPY_AND_ASSIGN(TypeName)class Simple{public:Simple(){}private:RTC_DISALLOW_COPY_AND_ASSIGN(Simple);};